Eagler's Nest
Airframes => Single Seaters => XL => Topic started by: grdev on February 08, 2014, 09:38:06 AM
-
Looking at the XL gear/wing fittings there seems to me to be a couple of dimensions not shown. On page 26 XL drawings it gives a dimension for the distance between the wing /gear mounting holes of 7/8" from the center of the bracket up and down. It shows the bracket dimension to be 2 3/4" wide which would give a center line of 1 3/8". It shows a 1/4" hole on the right down 7/8" from the center line and 2 1/2" from the lower gear 1/4" hole.
From looking at the drawing, and assuming the left lower hand side is "0" for "x" & "y" what would the dimension be for the center of the 1/4" hole for the gear & the longeron?
-
Looking at the XL gear/wing fittings there seems to me to be a couple of dimensions not shown. On page 26 XL drawings it gives a dimension for the distance between the wing /gear mounting holes of 7/8" from the center of the bracket up and down. It shows the bracket dimension to be 2 3/4" wide which would give a center line of 1 3/8". It shows a 1/4" hole on the right down 7/8" from the center line and 2 1/2" from the lower gear 1/4" hole.
From looking at the drawing, and assuming the left lower hand side is "0" for "x" & "y" what would the dimension be for the center of the 1/4" hole for the gear & the longeron?
Guess I'm a bit dense today....but I can't figure out what you are asking that isn't shown on the dwg....
I can, however, suggest you modify two of the brackets to incorporate the left aileron pulley per this photo:
(https://www.eaglersnest.com/forum/proxy.php?request=http%3A%2F%2Fhome.hiwaay.net%2F%7Esbuc%2FlegaleagleXL%2Fwing-32.jpg&hash=6dbf6204401397caff0d12356f7c494c53656cd5)
Including these mounts as part of the bracket would be more elegant than having separate brackets as shown. These mounts are necessary for the cable to clear the bottom fuse diagonal on the left side.
The right hand brackets are fine as drawn:
(https://www.eaglersnest.com/forum/proxy.php?request=http%3A%2F%2Fhome.hiwaay.net%2F%7Esbuc%2FlegaleagleXL%2Fwing-33.jpg&hash=2cb332ffb8e654c73cdc1ad04976b5c8dd765a22)
-
the drawing is a sketch, not to scale in any way, so I understand I have to make some of my own determinations by using what information is provided. it would be helpful to know just how for in from the edge of the bracket the hole centers are. I just asked how for away from the left hand side of the bracket those centers are using the lower left hand side of the bracket as 0 for a starting point to make my measurements. I can use the center line of the bracket a my "0" reference. I was talking about using the the same point the 4 1/2" dimension is. Simply put, how for over from the left hand side of the bracket are all the hole centers. I guess it really doesn't make much difference as the only real critical dimensions are the relationship of the hole for the longerons and the holes for the strut and gear so when you install your struts that when they don't pinch or interfere with the vertical tube at station two.
-
the drawing is a sketch, not to scale in any way, so I understand I have to make some of my own determinations by using what information is provided. it would be helpful to know just how for in from the edge of the bracket the hole centers are. I just asked how for away from the left hand side of the bracket those centers are using the lower left hand side of the bracket as 0 for a starting point to make my measurements. I can use the center line of the bracket a my "0" reference. I was talking about using the the same point the 4 1/2" dimension is. Simply put, how for over from the left hand side of the bracket are all the hole centers. I guess it really doesn't make much difference as the only real critical dimensions are the relationship of the hole for the longerons and the holes for the strut and gear so when you install your struts that when they don't pinch or interfere with the vertical tube at station two.
Standard minimum edge distance is two hole diameters from the hole center to the edge. In this case, I would fudge a little for a bit more edge distance.....those strut bolts are kinda important.....
-
Sam Buchanan said,
I can, however, suggest you modify two of the brackets to incorporate the left aileron pulley per this photo:
Builders will also want to know that you can't get 8 gear/strut brackets out of the 6x12" .090 steel sheet called out in the materials list. I started making my brackets tonight. MAN is that .090 4130 HARD! I was going through Bosch metal cutting blades fast. I ended up cutting the sheet with a zip wheel, using the edge of a 1/4" piece of plywood as an edge guide and my pneumatic grinder. Hey Sam; about how far down does the pulley mounting hole have to be located to clear the diagonal. By your picture it looks like about 1 1/2". I plan on building the difference right into those two brackets that will differ from the other six.
-
Sam Buchanan said,
I can, however, suggest you modify two of the brackets to incorporate the left aileron pulley per this photo:
Builders will also want to know that you can't get 8 gear/strut brackets out of the 6x12" .090 steel sheet called out in the materials list. I started making my brackets tonight. MAN is that .090 4130 HARD! I was going through Bosch metal cutting blades fast. I ended up cutting the sheet with a zip wheel, using the edge of a 1/4" piece of plywood as an edge guide and my pneumatic grinder. Hey Sam; about how far down does the pulley mounting hole have to be located to clear the diagonal. By your picture it looks like about 1 1/2". I plan on building the difference right into those two brackets that will differ from the other six.
I don't have a dimension, but 1.5" is probably pretty close, just scale the photos best you can. You might make the fitting a little over-size and trim to final size after rigging.
-
I don't have a dimension, but 1.5" is probably pretty close, just scale the photos best you can. You might make the fitting a little over-size and trim to final size after rigging.
Thanks Sam.
-
Sam i see the material called out for these brackets is 1/8th on the L/E.I do not have the plans for the XL,is there any difference in there function.i would like to use the thinner material if my plans are incorrect. Rex
-
>>>am i see the material called out for these brackets is 1/8th on the L/E.I do not have the plans for the XL,is there any difference in there function.i would like to use the thinner material if my plans are incorrect. Rex
I'm not necessarily recommending this but mine are made out of .063 with AN970 washers at the bolts for bearing surface...your call of course
FWIW a Pitts uses 080 there and an AcroSport 090. That's used single thickness at the gear bolt and doubled up where the flying wires(wing loads) mount.
My XL plans show 090.
-
Sam i see the material called out for these brackets is 1/8th on the L/E.I do not have the plans for the XL,is there any difference in there function.i would like to use the thinner material if my plans are incorrect. Rex
0.090" on my XL plans.
-
My bracket drawing shows a hole for the aileron pulley and makes no mention of the left being different from the right side. Am I OK to make all of these per the drawing? I'm a little confused about making the left one different but I may have read Sam's post wrong.
-
My bracket drawing shows a hole for the aileron pulley and makes no mention of the left being different from the right side. Am I OK to make all of these per the drawing? I'm a little confused about making the left one different but I may have read Sam's post wrong.
Jim, go to this page and scroll 1/2 way down the page to the aileron pulley discussion:
http://eaglexl-58/assembly-2.htm
I think the explanation will be sufficient to show why the pulleys need to be located differently on the left side. Not only is it necessary to displace the forward left pulley per the plans, I had to space the pulleys farther apart than shown on the plans in order to prevent the cables from being pulled out of line. All this stuff wasn't evident until I started rigging the plane and may be difficult to visualize until you reach that point.
My point was that the strap shown on the plans (dwg 18, bottom left corner) to relocate the pulley can be incorporated into the left brackets to reduce parts count. Hope this helps.
(https://www.eaglersnest.com/forum/proxy.php?request=http%3A%2F%2Fhome.hiwaay.net%2F%7Esbuc%2FlegaleagleXL%2Fwing-32.jpg&hash=6dbf6204401397caff0d12356f7c494c53656cd5)
-
Here is what I think a 1 piece bracket for the left aileron might look like. I won't know if this works until I get to the assembly of the pulleys and wires.
-
Jim, that is great, only thing though be prepared to do some trimming so you cross braces will clear. That will make it much easier, I think for others to build the brackets;D
-
Like I said though, I'm not sure the numbers are correct for the location of the pulley until I actually install them. I used 1-1/2 inch down from the other holes as a starting place.
I also shortened the main bracket as Leonard suggested on the drawings.
-
I wonder if a few 1/2" holes would be OK to remove some excess material?
-
Looks good, Jim.
Another option would be to go ahead and weld in the standard brackets, then weld extensions to them for the pulley when you rig the plane. That would still have the advantage of fewer parts count and hardware, but still easy to custom fit as necessary without needing to know dimensions in advance.
-
It looks like I will have to butcher nearly all the brackets to fit around the tubes. There is only one corner that they will remotely fit. Am I thinking right?
Here is a cardboard template that roughly shows what has to be cut away.